Logging swivel-joint.



J. V. ROBINSON. LOGGING SWIVEL JOINT.

APPLICATION FILED AUG. zo, 1909.

Patented Oct. 26, 1909.

` UNITED sragrns J'OSEPI-Ivv. ROBINSON, OF SALEM, OREG'N Loeeine sWrvnL-Jornm.

To. all.- whom it may. concern.:

Be it' known that lf, JosnPi-I V.. ROBINSON,

A a. citizen of the United; States, residing at Salem, inthe county of Marion.. and State/of Oregon, have invented certain new and useful Improvements in-.Logging Swivel-Joints, of which the following is a specification.

This invention relates to draft appliances l for .use in logging operations especially, al-

thoughV it is not to be limited in its use to any particular art.

ore particularly stated, the invention consists of a novel form of a log chain swivel, having. certain particular characteristics whereby it is better adapted for its uses than similar devices heretofore proposed.

For a full understanding of the invention, including its characteristic advantages, ref erence is to be had to the'following detail description and the accompanying draw- Figure 1 is a face view of the invention, partly broken away, and Fig. 2 is a cross sectional view substantially on the line 2-2 of Fig. 1. i

Throughout the following description and yon the several figures similar parts are referred to'. by like reference characters.

Referring particularly to thev drawings the swivel comprises two principal parts, the body 10 and a companion member or eye- 11.

The body part consists essentially ofa main hollow portion 10 which is substantially Spherical and having an eye 12 integral therewith; The eye portion consists of an eye proper 11 and a shank or neck 13 integral With the e e 11- and having` at its opposite end a hea 14. The eye portions of the said two parts of the swivel are substantially of the same configuration and are adapted to be connected to chain links 15 and 15 or to any other suitable form of drafappliance, such as cables. That portion of each eye with which the chain links coperate is substantially circular in cross section, so as to reduce friction to a minimum, and on the faces of the eyes may be formed flats 16 so as to add to the attractiveness of the appearance and to save any unnecessary expenditure of material.

The body and eye members ofy the swivel are assembled by compression under what is nowr. as the drop forge process. The` body O when hot is placed around the shark 13 and head 14 of the latter member when cold,

Specification ofzLetters Patent.

Patented Oct. 26; 1909.

Applicationrled August 20, 1909. Seri-a1 No. 513,794.

and' thereafter compress-ion is applied to shape the. body member 10 and te cause it 'to conform to the shape of. the said shank and head. By this process of construction the body member'cousists of; an` integral structure and therefore it is impossible for it to become separated from the shank. under ordinary circumstances. Each. of'fsaid swivel membsrs is reinforced at; the point of connection. between the eye` thereofjand the other part, at ythe-point where the gardanes-t danger of breakage exists,` by'ai collar' or rib 17 extending in a circulhr direction entirely therearound. I Again, additional rein-v forcing means'is .provided between said rib 17 and the lateral faces of the eyes as indicated at 17, constituting laterali bracing means. The head 14 is preferably substantiallyspherical on the side opposite the.

shank, and the edge or rim ofthe headis beveled as indicated at 111, whereby the assembling process is facilitated, Vand furthermore where the head and eye are .connected to the shank there are reinforcements 131 and 13", respectively. For a certain distance between the rim '14 and the reinforcement 13a the head is fiat, forming-a shoulder 14.?. In the operation .of the djrop hammer the -metal of the body 10" is drawn over or around the edge'lfi of the head and snugly down against the full length of 'the shank; the rounded strengthening or reinforcing features 13a and 13 b'serving also as important means to cause said metal to snugly embrace the shank as indicated. That portion of. the body 10 opposite the head 12k is maintained snugly againstthe spherical'portion of the head, thereby insuring that'the metal will be drawn over the edge 14. ing-'theT manner just stated. The l extension'`4g or strengthening rib 17 on the shank menrber 11 serves two addi-tionalimportant A,func-1 tions,-to direct the meta-l-v downwardly in use. In the finished article the body :33;0'l p has an vintimate snug fit on every vportierirffof the shank' member inclosedthereby, and.

whereby the introduction of gritos moisture is prevented. The structure combinesjthe maximum strength with ilthe `minimum of size, matters of extreme importance in a de- 1'10' vice intended for this purpose.

In order to provide an effective means for lubricationbetween the relatively movable snugly against the reinforcement', lbgitd parts of the swivel an oil pocket is provided at 18 in one side of the body member. When this cavity is lled with a heavyA character of lubricant, lthe opening thereto is closed by means of a plug in the nature of a screw plu 19, `All dust anddirt are practically excided from the bearing and the parts re- I main lubricated for a long period of time.

Havingthus described the preferred em-l bodiment of the invention, what is claimed asnew is The herein described logging swivel comprising a hollow body memberand a companion member having a shank and head snugly inclosed n Within the vhollow .i body vmember and having integral attachment means, said shank having at each end, where it is attached to the head and attachment means, la rounded reinforce, Asaid head having a beveled ed? sald ed e and t 1e adjacent reinforce, f'orme ,and a flat portion between ing a s oulder, and the shank member being provided with a circular outwardly eX- tendingcollar constituting a brace for the adjacent end of the hollow body member, the metal of the saidhollow body conforming'snugly to all parts ofthe shank memb r inclosed thereby, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH V. ROBINSON.

Witnesses CALVIN T. MILANs, GEO. D. RILEY. 

